Tethered ball re-sending device for tennis, has calibrated return thread supported at one of ends of pole, rotative swivel situated at end of one of withdrawal cords, and specialty ball connected to swivel

摘要

The device has an telescopic pole (3) at tennis net level, which includes an end fixed to a base. A calibrated return thread (2) is supported at another end of the pole, and a non withdrawal cord is connected to a long return rubber band (10) tied to another non withdrawal cord. A rotative swivel (12) is situated at an end of latter cord, and a specialty ball (14) is connected to the swivel.